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LibSoftGPU: Use destination alpha for texture decal function

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According to the OpenGL spec, the decal function uses the destination
(or texture) alpha instead of the source alpha. This fixes the sky in
GLQuake.
This commit is contained in:
Jelle Raaijmakers 2022-03-06 00:21:58 +01:00 committed by Andreas Kling
parent fd628cdfec
commit 9fc419395e
Notes: sideshowbarker 2024-07-17 17:53:36 +09:00 
Author: https://github.com/gmta
Commit: https://github.com/SerenityOS/serenity/commit/9fc419395e
Pull-request: https://github.com/SerenityOS/serenity/pull/12898
1 changed files with 4 additions and 4 deletions
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8
Userland/Libraries/LibSoftGPU/Device.cpp
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@ -1016,10 +1016,10 @@ ALWAYS_INLINE void Device::shade_fragments(PixelQuad& quad)
quad.out_color = texel;
break;
case TextureEnvMode::Decal: {
auto src_alpha = quad.out_color.w();
quad.out_color.set_x(mix(quad.out_color.x(), texel.x(), src_alpha));
quad.out_color.set_y(mix(quad.out_color.y(), texel.y(), src_alpha));
quad.out_color.set_z(mix(quad.out_color.z(), texel.z(), src_alpha));
auto dst_alpha = texel.w();
quad.out_color.set_x(mix(quad.out_color.x(), texel.x(), dst_alpha));
quad.out_color.set_y(mix(quad.out_color.y(), texel.y(), dst_alpha));
quad.out_color.set_z(mix(quad.out_color.z(), texel.z(), dst_alpha));
break;
}
default: